use warnings;
use strict;

%0 = (a=>1);
@| = (1..3);

# @a =(1..3);  #  'requires explicit package name'  if uncommented

##</code><code>##

Perl identifiers that begin with digits, control characters, or punctuation characters are exempt from the effects of the package declaration and are always forced to be in package main ; they are also exempt from strict 'vars' errors. A few other names are also exempt in these ways:

        ENV      STDIN
        INC      STDOUT
        ARGV     STDERR
        ARGVOUT
        SIG